Vulnerability-Lookup

RHSA-2026:53734

Vulnerability from csaf_redhat - Published: 2026-08-11 17:14 - Updated: 2026-08-11 17:16

Summary

Red Hat Security Advisory: OpenShift Virtualization v4.21 Images

Severity

Important

Notes

Topic: Red Hat OpenShift Virtualization release v4.21 is now available with updates to packages and images that fix several bugs and add enhancements.

Details: OpenShift Virtualization is Red Hat's virtualization solution designed for Red Hat OpenShift Container Platform. This advisory contains OpenShift Virtualization v4.21 images.

Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

CVE-2026-40898

A flaw was found in quic-go, an implementation of the QUIC protocol in Go. A remote attacker can exploit this by sending specially crafted HTTP/3 trailer fields. This can cause the system to allocate excessive memory, leading to a denial-of-service (DoS) condition where the affected server or client may crash or run out of resources.

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE-770 - Allocation of Resources Without Limits or Throttling

Affected products

Fixed 3 products

Product	Version	Remediation
Unresolved product id: Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/kubevirt-apiserver-proxy-rhel9@sha256:3d5e780f39f8c43db9a3a874abe982f658597018e534692199d1d3efa1fa9949_s390x	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/kubevirt-apiserver-proxy-rhel9@sha256:87a974f9fb639ab3a3c20dc40e1ee88dc4f6cd5ee3f55b4397a99e2c1defd5ca_arm64	—	Vendor Fix fix Workaround
Unresolved product id: Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/kubevirt-apiserver-proxy-rhel9@sha256:f0f9c298f70edf207f4efa03b5fb51c34886d68deb2dda4ab7dc2ad3e5e0fefe_amd64	—	Vendor Fix fix Workaround

Threats

Impact Important

References

10 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:53734	self
https://access.redhat.com/security/cve/CVE-2026-40898	external
https://access.redhat.com/security/updates/classi…	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-40898	self
https://bugzilla.redhat.com/show_bug.cgi?id=2484875	external
https://www.cve.org/CVERecord?id=CVE-2026-40898	external
https://nvd.nist.gov/vuln/detail/CVE-2026-40898	external
https://github.com/quic-go/quic-go/releases/tag/v0.59.1	external
https://github.com/quic-go/quic-go/security/advis…	external

JSON

To clipboard

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      "remediations": [
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          "date": "2026-08-11T17:14:33+00:00",
          "details": "Before applying this update, make sure all previously released errata relevant to your system have been applied.\n\nFor details on how to apply this update, refer to:\n\nhttps://access.redhat.com/articles/11258",
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          "restart_required": {
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          "url": "https://access.redhat.com/errata/RHSA-2026:53734"
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        {
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          "details": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.",
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          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/kubevirt-apiserver-proxy-rhel9@sha256:3d5e780f39f8c43db9a3a874abe982f658597018e534692199d1d3efa1fa9949_s390x",
            "Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/kubevirt-apiserver-proxy-rhel9@sha256:87a974f9fb639ab3a3c20dc40e1ee88dc4f6cd5ee3f55b4397a99e2c1defd5ca_arm64",
            "Red Hat Container Native Virtualization 4.21:registry.redhat.io/container-native-virtualization/kubevirt-apiserver-proxy-rhel9@sha256:f0f9c298f70edf207f4efa03b5fb51c34886d68deb2dda4ab7dc2ad3e5e0fefe_amd64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "github.com/quic-go/quic-go: quic-go: Denial of Service via excessive memory allocation in HTTP/3 trailers"
    }
  ]
}

CVE-2026-40898 (GCVE-0-2026-40898)

Vulnerability from cvelistv5 – Published: 2026-06-04 17:43 – Updated: 2026-06-04 18:40

Title

quic-go: HTTP/3 QPACK Trailer Expansion Memory Exhaustion

Summary

quic-go is an implementation of the QUIC protocol in Go. Prior to version 0.59.1, an attacker can cause excessive memory allocation in quic-go's HTTP/3 client and server implementations by sending a QPACK-encoded HEADERS frame that decodes into a large trailer field section with many unique field names and/or large values. The implementation builds an `http.Header` for the corresponding `http.Request` or `http.Response`, while only enforcing limits on the size of the QPACK-compressed HEADERS frame, not on the decoded field section. This can lead to memory exhaustion. This is very similar to CVE-2025-64702. The difference is that this issue uses HTTP trailers, rather than HTTP headers, as the attack vector. A misbehaving or malicious peer can cause a denial-of-service (DoS) attack against quic-go's HTTP/3 servers or clients by triggering excessive memory allocation, potentially leading to crashes or resource exhaustion. This affects both servers and clients due to symmetric header construction. Version 0.59.1 enforces RFC 9114 decoded field section size limits for trailers as well. It incrementally decodes QPACK entries and checks the field section size after each entry, aborting the stream if an entry causes the limit to be exceeded.

Severity

5.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/quic-go/quic-go/security/advis…	x_refsource_CONFIRM
https://github.com/quic-go/quic-go/releases/tag/v0.59.1	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
quic-go	quic-go	Affected: < 0.59.1

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-40898",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-04T18:40:25.619349Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-04T18:40:44.304Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "quic-go",
          "vendor": "quic-go",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.59.1"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "quic-go is an implementation of the QUIC protocol in Go. Prior to version 0.59.1, an attacker can cause excessive memory allocation in quic-go\u0027s HTTP/3 client and server implementations by sending a QPACK-encoded HEADERS frame that decodes into a large trailer field section with many unique field names and/or large values. The implementation builds an `http.Header` for the corresponding `http.Request` or `http.Response`, while only enforcing limits on the size of the QPACK-compressed HEADERS frame, not on the decoded field section. This can lead to memory exhaustion. This is very similar to CVE-2025-64702. The difference is that this issue uses HTTP trailers, rather than HTTP headers, as the attack vector. A misbehaving or malicious peer can cause a denial-of-service (DoS) attack against quic-go\u0027s HTTP/3 servers or clients by triggering excessive memory allocation, potentially leading to crashes or resource exhaustion. This affects both servers and clients due to symmetric header construction. Version 0.59.1 enforces RFC 9114 decoded field section size limits for trailers as well. It incrementally decodes QPACK entries and checks the field section size after each entry, aborting the stream if an entry causes the limit to be exceeded."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-770",
              "description": "CWE-770: Allocation of Resources Without Limits or Throttling",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-04T17:43:36.803Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/quic-go/quic-go/security/advisories/GHSA-vvgj-x9jq-8cj9",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/quic-go/quic-go/security/advisories/GHSA-vvgj-x9jq-8cj9"
        },
        {
          "name": "https://github.com/quic-go/quic-go/releases/tag/v0.59.1",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/quic-go/quic-go/releases/tag/v0.59.1"
        }
      ],
      "source": {
        "advisory": "GHSA-vvgj-x9jq-8cj9",
        "discovery": "UNKNOWN"
      },
      "title": "quic-go: HTTP/3 QPACK Trailer Expansion Memory Exhaustion"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-40898",
    "datePublished": "2026-06-04T17:43:36.803Z",
    "dateReserved": "2026-04-15T16:37:22.766Z",
    "dateUpdated": "2026-06-04T18:40:44.304Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

RHSA-2026:53734

CVE-2026-40898 (GCVE-0-2026-40898)

Tags

Sightings

Nomenclature